#qi-hardware IRC log for Saturday, 2014-05-03

just want to check if what i'm thinking is current....if datasheet says the backlight max current is 40mA and voltage is 20 which means it is 0.81W than I can supply 24v but 25mA which is 0.6W ... am I correct ?

just want to check if what i'm thinking is correct....if datasheet says the backlight max current is 40mA and voltage is 20 which means it is 0.81W than I can supply 24v but 25mA which is 0.6W ... am I correct ?

it may be that it still works, though. since it's a bit more complicated than a resistor :) you can test such things with a lab power supply. just set the voltage to 20 V, current to 25 mA, and see what happens

if you intend to operate outside the specification, you also have to make sure you know under what circumstances you'll exceed the limits. e.g., if the display has highly variable consumption depending on content, then you need to make your tests with the "worst-case" content

what you mean by "okay, current-controlled. then you're fine if you set it to 25 mA. the circuit will figure out the rest." ... are you saying that the IC even it outputs 24V and the current via jumper is specified 25mA it knows how much current to pass ?

btw, just had an idea regarding biometric authentication. with the advances in the field of induced pluripotency, i wonder if it could become feasible to use cloning to get at someone's biometric markers.

DocScrutinizer51: question: am i right assuming that making a test fixture that produces a variable field roughly resembling a human finger making controlled movements would be fairly simple ? e.g., without moving parts or other fancy components ?